Red alumina color-lakes obtained from aminoxanthopurpurin-sulfulfonic acids.



UNITED STATES PATENT onnicn.

CARL THUN, F ELBERFELD, AND PAUL TUST AND PAUL THOMASCHEWSKI, 0F VOH- WINKEL, NEAR ELBERFELD, GERMANY, ASSIGNORS-TO SYNTHETIC PATENTS 00.,

me, on NEW ORK, N. Y., A conronn'rion on NEW YORK.

nnn ALUMINA oonoremxns OBTAINED mom AMINOXANTHOPURPURIN-SULFONIC 7 acres.

No Drawing.

Specification of Letters Patent.

Application filed July 17, 1913. Serial No. 779,543.

Patented Mar. '17, 1914;

To all whom it may concern Be it known that we, CARL THUN, PAUL TUST and PAnnTnomAsonnwskr, doctors of hilosophy, chemists, citizens of the German mpire, residing, respectively, at Elberfeld, Vohwinkel, andVohwinkel near Elberfeld,

' Germany, have invented new and useful Imrovements in Red Alumina Color-Lakes btained from Aminoxanthopurpurin-Sulionic Acids, of which the following is a specification.

. We have found that theaminoxanthopurpurin sulfonic acids having most probably the formulae:

I Go l( 0H (2) CuH4 cO Ca (4) sosn yield valuable pigments or lakes when treated with alumina as substratum. The new more fully lakes have a valuable clear bluish-red shade and are fast to light.

In order to illustrate the new process the following examples are given, the parts being by weight:

vExample 1; 20 parts of aluminium sulfate (18 per cent. A1 0 and 1 part of 1-amino-2.4:-dioxyanthraquinone 3 sulfonic acid (sodium salt) having the formula:

are dissolved in 180 parts of hot water and.

the lake is precipitated from the filtered solution with a solution of 80parts of a 10 er cent. solutionof sodi um carbonate. The ake is filtered ofi, washed, dried and ground. It shows a deep purple red color.

Example 2:"1 part of 1-amino-2.4-dioxyanthraquinone-3-sulfonic acid (sodium salt) are dissolved inwater. 150 partsof water and the filtered solution is boiled up with 4:7

parts of alumina hydrate in paste (10 per cent. Al (OH) The lake is then filtered off, washed, dried and ground.

-Any other method for producing pig- ,ments or lakes can be used.

We claim 1. The new red alumina color lakes prepared from aminoxanthopurpurin sulfonic CARL THUN. [L- 8.] PAUL TUST. r [L- 8.] PAUL THOMASCHEWSKI. [L- 8.]

Witnesses:

HELEN NUFER, ALBERT NUFCER.

Copies of this patent may be obtained for live cents each, by addressing the Commissioner or Iatenta, Washington, D. G. 

